Reunion
When Sirius reached Number Four Privet Drive Harry was working in the garden. Sirius stayed in dog form and tried to think of how best to approach him. He couldn't take Harry away to live with him, he was still a fugitive, but he wanted to be in Harry's life.
Sirius was pulled from his thoughts when a woman walked past the house and called out, "Harry. Hello dear, lovely weather isn't it?"
Harry froze, eyes widening in fear. He didn't say anything.
"Hello? You know you really should answer when someone speaks to you, young man. It's incredibly rude not to." The woman continued.
Sirius could see Harry's hand start to shake. Of course, that was when Sirius realized how he could be part of Harry's life. He remembered a muggle born back at school talk about service dogs. Maybe he could do that for Harry.
When the woman opened her mouth to speak again Sirius ran towards them, barking like mad. Harry jumped at the sound. The woman screamed and ran off. Sirius trotted to Harry's side and licked his arm. Harry giggled and scratched his ears.
"Where'd you come from?" He smiled.
Sirius barked and nudged Harry's chest.
"Boy!" Vernon Dursley came out of the house with a scowl. Harry gripped Sirius's fur tightly. "What're you doing with a dog, boy?"
"He-he just came running up to me, Uncle Vernon." Harry answered.
"Get rid of it."
Sirius snarled at him as he walked back into the house then turned and licked Harry's cheek.
Harry smiled. "Sorry, dog. Uncle Vernon will probably call animal control or something if you don't leave." Sirius whined. "You seem like a good dog. I wish I could keep you, I've always wanted a dog."
Sirius stayed by Harry's side until the boy hugged him and went inside.
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The next day when Vernon opened the door to leave for work Sirius ran into the house. He found Harry in the kitchen washing dishes. Harry smiled when he saw him. The smile dropped away when he heard Vernon yelling.
"Please go." Harry hissed. "I don't want you to get hurt."
Sirius jumped up to lick his face.
Vernon and Petunia burst into the room. Vernon tried to grab Sirius. He snapped at his hand and Petunia screamed.
"Boy! Get that mangy best out of my house right now!" Vernon's face was bright red.
"Y-yes Uncle." Harry squeaked. He grabbed the scruff of Sirius's neck and gently pulled him out of the house. "I'm sorry." He whispered.
When Harry went out to mow the lawn, Sirius happily returned to his side. He left when his godson was finished.
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That night Sirius snuck into the house and cast a compulsion charm on Harry's aunt and uncle. It wasn't totally legal but hey, he was already a fugitive.
The next morning Vernon took Sirius to get his licence and make him an official service dog. It took a lot longer than Sirius had hoped. In fact he was left with people he guessed were trainers for a couple days. He managed to use magic to speed things up a bit.
Finally, Petunia brought Harry to pick him up.
"I'm sorry, we still don't have a name for this guy." One of the trainers said.
Petunia pushed Harry forward. The boy wrapped his arms around Sirius and buried his face in his fur.
"Um," the trainer frowned. "We can't finish the paperwork without a name." She looked at Petunia expectantly.
Harry took a shaky breath. "Shadow." He whispered.
"I'm sorry, Shadow?" She repeated. Harry nodded tightening his hold on Sirius as he did. "Okay. I'll finish everything up and you can take him home."
"Thank you." Petunia said flatly.
An hour later they were back in the car. Sirius was proudly wearing a collar and service dog jacket. Harry wouldn't let go of him.